C-Mount male-to-female extension tube / macro extension ring designed for industrial, machine-vision and CCTV camera lens systems.

The adapter features a black metal construction with a fully knurled exterior for easy installation and removal. One end provides an external threaded connection while the opposite end provides an internal threaded connection, allowing the extension tube to be installed between a compatible C-mount lens and camera.

Extension tubes increase the lens-to-camera spacing and are commonly used to shift the focusing range toward shorter working distances for close-up and macro imaging applications.

The construction is consistent with extension rings used with Pentax/Cosmicar and other C-mount industrial lenses. However, there are no manufacturer or part-number markings visible on this particular item, so the manufacturer and exact model are not confirmed.

Approximate outside diameter measured from the supplied item: 31 mm.

Used, fully functional.

Specifications:

• Type: Lens extension tube / macro extension ring
• Application: Industrial camera, machine vision and CCTV lens systems
• Connection configuration: Male-to-female threaded
• Mount type: Appears consistent with C-mount
• Approx. outside diameter: 31 mm
• Construction: Metal
• Finish: Black
• Exterior: Knurled grip
• Optics: None
• Manufacturer: Not confirmed
• Model / Part Number: Not confirmed